In Certinia PSA, system-wide and group-specific behaviors, such as how utilization is calculated, are managed within Configuration Groups. The setting to control whether holiday hours are deducted from a resource's total available hours is located in the "Utilization" section of the relevant Configuration Group. By navigating to this section and deselecting (setting to false) the "Subtract Holidays From Total Hours" option, the system will no longer reduce the denominator (total hours) in the utilization calculation for holidays, thereby treating them as part of the total available time.

A. The "PSA Administration" tab is a custom container for various admin links but is not the direct location for configuring core calculation logic like utilization settings.

C. The "Utilization Calculation" object stores the results of utilization calculations, not the configuration settings that govern how those calculations are performed.

1. Certinia PSA Administrator Guide, "Utilization Settings Fields": This section explicitly details the UtilizationSubtractsHolidays field (labeled "Subtract Holidays From Total Hours" in the UI). It confirms that when this setting is false, "holiday hours are not subtracted from the total hours in the resource's work calendar." The guide also specifies these settings are accessed via Configuration Groups.

2. Certinia PSA Help Portal, "Configuration Groups": This documentation outlines that Configuration Groups are the central mechanism for controlling application settings. It establishes that to modify a setting like the one in the question, the administrator must edit the appropriate Configuration Group record.